Heat the oil in a frying pan over a high heat and fry the racks of lamb for 2 minutes on each side, or until brown. Transfer to a roasting tin, add the rosemary and roast for 8 minutes.

should you air fry instead of oven roast ... wonderful caramelized exterior from oven roasting, you'd need to pan-sear your rack of lamb first. But that means more mess to clean, an even longer ...